If it is just a position problem, you can edit your UI_charname_server.ini file and change the position. Look for the [CastSpellWnd] section (if we are thinking about the same window). Then, there should be XPosxxx= and YPosxxx= settings. The xxx is the Video mode, like 1024x768, or windowed, whatever one you are using. One or both of the settings is probably too high, or negative. Change the number after the equal sign for both entries to something relatively low. Like 50. Then, re-load the UI from the options window. It should reappear towards the top left based on what you entered.